Why do we use Subnet mask? What are its uses?

Showing Answers 1 - 25 of 25 Answers

Shahzad Siddiqui

  • Aug 26th, 2006
 

Subnetmask is use to isolate the network ID and Host ID. eg- if an IP is:192.168.0.1 then the default subnet is:255.255.255.0 because it is a C Class Address C Class Add. have 3 network octate and 1 host octate i.e.

network ID :192.168.0.0

host ID      : 0.0.0.1

Bashur

  • Aug 29th, 2006
 

Hi Shahzad Siddiqui,thanx for u r response,u r answer is nice,from,Bashur

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Engg Muhammad Waseem

  • Sep 1st, 2006
 

The main purpose of subnetmasking is to reduce the broadcast domain or in other words to reduce to heavy network traffic.

The use of subnet mask actually tells you the number of host/terminals that could be used on the same network. It is actually very simple, for eg an IP address 192.168.0.1 with the subnet mask of 255.255.255.0. Just look at the 'ON' bits in this subnet mask (11111111.11111111.11111111.00000000), this clearly indicates that the number of host/terminal that can use the same network are configured and assigned from the last octet. So the number of combination one can drive from the last octect (2x2x2x2x2x2x2x2)= 255 (0-254) which is number of devices that can be used over the network

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Rajgopal Medpur

  • Sep 20th, 2006
 

What is the relation between IP address,Gateway address,Nemask address

Ram

  • Sep 20th, 2006
 

Is there is any  relation between subnet and gateway

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khadar

  • Oct 10th, 2006
 

My question is to know how we calculate subnetmask for 3 classes But I know to calculate subnetmask for class c but other then.

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Bhavica

  • Nov 23rd, 2006
 

A subnet allows the flow of network traffic between hosts to be segregated based on a network configuration. By organizing hosts into logical groups, subnetting can improve network security and performance. the most recognizable aspect of subnetting is the subnet mask. Like IP addresses, a subnet mask contains four bytes (32 bits) and is often written using the same "dotted-decimal" notation. For example, a very common subnet mask in its binary representation

    11111111 11111111 11111111 00000000
is typically shown in the equivalent, more readable form
    255.255.255.0

 

Jai Singh

  • Dec 29th, 2006
 

Subnet mask is 32 bit long TCP/IP address divided in four equal part.It is used for isolation of network address and host address.

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sooraj k r

  • Jun 24th, 2007
 

Subnetmak is used to identify the network based on the number of bits and the main purpose of subnetmask is to make independent and equal of the network.

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naga_u_i2

  • Jul 27th, 2007
 

Actually Subnet mask is used to Separate Network Bits from Host Bits,

For Eg for class C IP address 192.168.0.1 subnet mask is 255.255.255.0

so here u can see 255.255.255 mask the Network portion ie., 192.168.0. and leave 8 bits i.e.,[.0] 255 for Host. 

So Here we can connect up to 255-1 = 254  Hosts for the 192.168.0 network.
 
Similarly for class B IP address 172.168.0.1 subnet mask is 255.255.0.0

so here u can see 255.255 mask the Network portion i.e., 172.168 and leave 16 bits i.e, [0.0.] 255.255 for Host.
 
So here we can connect up to 65,532 hosts for the 172.168.0.1 Network.

If u have any doubts can ask me...... thanks

naveemb

  • Sep 27th, 2008
 

I don't see the reason why a subnet mask has to be used with default networks like Class A-B-C..., unless you a using subnetting.

the reason i say this becasue with the default networks, the ip address itself will help identifying the network and host id.

for example 128.45.56.67
The very fist octect would tell that this is Class B network.
Here N/w is 128 
Host is 45.56.67.

in the begining when ip address were defined there was no subnetting defined(am i correct here?). And when no subnetting was thought then why did they plan to use a subnet mask?

Any body has a answer,then please help me understand this.

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Devang

  • Sep 23rd, 2011
 

We use sub netting for divide a huge network in subnetwork or some user use for some security reasons

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prashant

  • Mar 4th, 2012
 

sub netting is used to divide an ip address into many ips.
this is must coz we cant give an ip (without sub-netting) to every station. so sub-netting is important

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gaurav

  • May 3rd, 2012
 

As its name suggest it is subnetting a big network in to small pieces to effectively use the network bandwidth for e.g 126.0.0.1 the subnet will be 255.0.0.0 in this case all system which are having starting ip number =126 can communication to any other system on the network.in second case class b network eg-172.168.0.1 the subnet will be 255.255.0.0 here all system which are having first to number as 172.168 can communicate to any other system with in network in third case class C networking eg-192.168.1.1 subnet will be 255.255.255.0 here only those system can communicate to each other which are having first three number as same......

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if we are having network of 192.168.0.0 no doubt default subnet mask would be 255.255.255.0
network ip would be 192.168.0.0 and broadcast IP would be 255.255.255.255 but host IDs must fall under 192.168.0.1 to 192.168.255.254 not 0.0.0.1...

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Rahul

  • Dec 22nd, 2012
 

Subnet mask is used to Segment the IP address into HOST and NETWOK.
It used to how many bit is used for Netwok and How many for Host.

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nathsambu

  • Dec 22nd, 2012
 

Subnet mask is use only to identify the class of ip address.
Example : c class ip is 192.168.1.1 and subnet mask is 255.255.255.0
In class c, three octal are full i.e. three network part and last one is host part.
Three network part full means we cant change the network part.

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Ravinder Kumar

  • Dec 24th, 2012
 

how is subnetting use in networking and host and subnet id is .i dont understand the subnetting pls deeply and detail wise information send me.

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Siva

  • Jun 19th, 2013
 

Creating multiple indepedentnetworks from a single a network..

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rahul

  • Sep 14th, 2013
 

Subnet mask is used for differentiate the network between network bit and host bit,
by using the subnet mask we know that the how many bit use for network and how many bit use for host

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Er.Harneet Singh

  • Oct 4th, 2014
 

sub netting is used to reduce the network traffic.

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baswaraj

  • Nov 5th, 2014
 

Subnet mask is differentiate network and host partitions of address  if ip address as 172.68.0.1 255.255.0.0 it is in class b here 255,255 are network id and 0 0 host id

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pradeesh

  • Nov 20th, 2014
 

thank you..... give briefly

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